Pelle van Amersfoort scored a
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Heerenveen still
In the second half, Sam Lammers missed a great chance for the hosts before Warner Hahn denied Jurgen Mattheij at the other end.
The game was heading for a goalless draw but in the last minute, Pelle van Amersfoort slotted a cross into the bottom corner to seal victory for the hosts.
Heerenveen are now ninth in the table while Excelsior remain in danger and only one point above the drop zone.